Not taking sides on whether the GP is being hurtful, or the submitter really is in that much pain, but I feel there is a certain point where scientifically we should be able to say "no, you're just being a hypochondriac".
That a very unscientific use of hypochondriac and it drips with contempt, which is a form of prejudice, which is a form of irrationality.
People's ability to sense traverses a wide range, and people at the extreme edge of that range are in no way hypochondriacs, rather their discomfort can be very real. And understanding that difference is not only considerate, it can be profitable. Example: ring tones most old people can't hear due to loss of high frequency hearing capability.
I'm getting older, 45, and I can hear those tones. In fact I've always been highly sensitive to high frequencies, and one of the things I always hated about CRTs was the whine they make. It gave me headaches so when LCDs came along, I got one early on -- I think I paid $600 for it, but it was such a sweet relief, that it worth it to me. Now, I'm lucky in that I don't notice any flickering, and I'm relieved of the suffering CRTs caused me, but it sounds like other people have the opposite problem. Someone who decides to not be contemptuous, is going to make some decent money, maybe a lot of money, selling them solutions for what is a very real problem for them.